PracticeExam4

PracticeExam4 - CHM 2045C 1. A silicon atom has _ valence...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
CHM 2045C Practice Exam 4 1. A silicon atom has ____ valence electrons. a. 0 b. 2 c. 4 d. 6 e. 10 2. Which combination of atoms is most likely to produce a compound with ionic bonds? a. Al and F b. P and H c. C and O d. Si and O e. S and Br 3. Which of the following statements are CORRECT? 1. Ionic bonds form when one or more valence electrons are transferred from one atom to another. 2. Covalent bonds involve sharing of electrons between atoms. 3. Ionic bond formation is always exothermic; covalent bond formation is always endothermic. a. 1 only b. 2 only c. 3 only d. 1 and 2 e. 1, 2, and 3 4. The lattice energy of LiBr is -815 kJ/mol. This energy corresponds to which reaction below? a. Li(s) + Br 2 (g) LiBr(s) b. Li(g) + Br(g) LiBr(g) c. Li(g) + Br(g) LiBr(s) d. Li + (aq) + Br - (aq) LiBr(s) e. Li + (g) + Br - (g) LiBr(s) 5. What is the total number of valence electrons in a carbonate ion? a. 20 b. 22 c. 24 d. 26 e. 30 6. Which of the following molecules or ions are isoelectronic: SO 2 , CO 2 , NO 2 - , ClO 2 - ? a. SO 2 and CO 2 b. SO 2 and NO 2 - c. CO 2 and ClO 2 - d. NO 2 - and ClO 2 - e. SO 2 , NO 2 - , and ClO 2
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
7. Which of the following species will have a Lewis structure most like that of carbon disulfide, CS 2 ? a. NO 2 - b. SO 2 c. H 2 S d. SF 2 e. SCN - 8. Which of the following is a correct Lewis structure for N 2 O? a. 1 b. 2 c. 3 d. 4 e. 5 9. Which of the following is a correct Lewis structure for the phosphate ion? a. 1 b. 2 c. 3 d. 4 e. 5
Background image of page 2
10. Which of the following are resonance structures for sulfur dioxide, SO 2 ? a. 1 and 2 b. 2 and 4 c. 3 and 4 d. 1, 2, and 3 e. 2, 3, and 4 11. What is the correct Lewis structure for IF 3 ? a. 1 b. 2 c. 3 d. 4 e. 5 12. The central atom in IF 2 - is surrounded by a. no single bonds, 2 double bonds, and no lone pairs of electrons. b. no single bonds, 2 double bonds, and 2 lone pairs of electrons.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 7

PracticeExam4 - CHM 2045C 1. A silicon atom has _ valence...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online